Which of the following materials is used in the manufacture of resistance grids to be used in the starters of largemotors ?

The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type

A

Star connected only

B

Delta connected only

C

Both (A) and (B)

D

None of the above

Starters are used with D.C. motors because

A

These motors have high starting torque

B

These motors are not self-starting

C

Back e.m.f. of these motors is zero initially

D

To restrict armature current as there is no back e.m.f. while starting

A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

A

10-15

B

30-40

C

70-80

D

90-100

If 15 men working independently and at the same rate can manufacture 27 baskets in an hour, how many baskets would 45 men working independently and at the same rate manufacture in 40 minutes?

A

27

B

35

C

40

D

54

If 15 men working at the same rate can manufacture 27 baskets in an hour, how many baskets would 45 men manufacture in 40 minutes?

A

27

B

54

C

35

D

40

For handling materials during manufacture of cement, a _________ is widely used.

A

Belt conveyor

B

Bucket conveyor

C

Fork lift truck

D

Overhead crane

For the manufacture of Portland cement, the proportions of raw materials used, are

A

Lime 63% ; silica 22% ; other ingredients 15%

B

Lime 22% ; silica 63% ; other ingredients 15%

C

Silica 40% ; lime 40% ; other ingredients 20%

D

Silica 70% ; lime 20% ; other ingredients 10%

Fill in the gap : Due to the ----of the materials needed to manufacture the product and the increasing demand for it, it is highly probable that the final cost to the consumer will ----.

A

scarcity ---relax

B

immensity--evolve

C

paucity--escalate

D

certainly ---fluctuate

Digestion of wood-base materials (for manufacture of pulp) is done to

A

Remove lignin

B

Produce long fibres

C

Prevent deterioration on storage

D

None of these

Raw materials for 'Solvay Process' for manufacture of the soda ash are

A

Salt, limestone and coke or gas

B

Ammonia, salt and limestone

C

Ammonia limestone and coke

D

None of these

Which of the following materials is used in the manufacture of resistance grids to be used in the starters of largemotors ?

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